Image Reading Apparatus Visible Wavelength Interference Reduction
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Solution Overview
Problem
Existing image reading apparatuses face difficulties in distinguishing between invisible and visible images, particularly when using ultraviolet (UV) light, as the visible wavelength component interferes with the detection of invisible images, leading to incorrect recognition of barcodes and other embedded information.
Innovation Solution
An image reading apparatus that includes a visible light source, an invisible light source, and a reduction unit, where the reduction unit adjusts the light amount of the visible light source to minimize the visible wavelength component received by the invisible image sensor, allowing for the isolation of invisible images from visible images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the visible light source is used to illuminate the object, then the visible image quality is maintained, but the visible wavelength component interferes with the detection of invisible images by the invisible imaging sensor
Solution Approach 1:
The patent extracts and removes the visible wavelength component from the light received by the invisible imaging sensor through a bandpass filter that transmits only invisible wavelengths (e.g., UV). This separates the useful invisible light signal from the harmful visible light interference, allowing accurate detection of invisible images without contamination from visible image data
Solution Approach 2:
The patent introduces a bandpass filter as an intermediary component between the object and the invisible imaging sensor. This filter acts as a mediator that selectively transmits invisible wavelengths while blocking visible wavelengths, enabling the sensor to receive only the desired invisible light signal and eliminating visible light interference
2Illumination intensity
If the light amount of the visible light source is increased to improve visible image quality, then the visible image reading is enhanced, but the interference with invisible image detection increases
Solution Approach 1:
The patent segments the illumination function by using separate visible and invisible light sources that can be independently controlled. The visible light source intensity can be adjusted without affecting the invisible light source, allowing optimization of visible image quality while maintaining conditions suitable for invisible image detection
Solution Approach 2:
The bandpass filter serves as an intermediary that protects the invisible imaging sensor from visible light interference regardless of the visible light source intensity. This allows the visible light source to operate at optimal brightness for visible image capture without compromising invisible image detection accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the interference of visible wavelength components, enabling accurate recognition of invisible images, such as QR codes and authenticity marks, while maintaining the quality of visible images, thus improving the reliability of image reading processes.
Implementation Method 1
a first light source that irradiates an object with visible light
Implementation Method 2
a second light source that irradiates the object with invisible light
Implementation Method 3
performs photoelectric conversion on the received light
Implementation Method 4
reads an invisible image of the object with an invisible imaging sensor
Data Source
AI summary
An image reading apparatus includes a first light source, a second light source, a visible imaging sensor, an invisible imaging sensor, and a reduction unit. The first light source irradiates an object with visible light. The second light source irradiates the object with invisible light. The visible imaging sensor reads a visible image of the object. The invisible imaging sensor reads an invisible image of the object. The reduction unit reduces a visible wavelength component of light received by the invisible imaging sensor.